At the beginning of the cruise, the 

 sampling routine at each station generally 

 required an hour when all three observations 

 were made: hydrographic cast, current 

 measurement, bottom ssimpling. Later in the 

 cruise only the hydrocast was tjiken which 

 reduced the time on each station to about 

 20 minutes. 



Hydrographic Casts 



Reversing water bottles were cast at 

 the surface, 5 and 10 meters, and 10-meter 

 intervals therearfter to the bottom; occa- 

 sionally the final spacing was only 5 meters. 

 Each water bottle carried one protected 

 thermometer. 



Samples were drawn for analysis of 

 chJorinity and dissolved oxygen at all depths. 



Bottom Samples 



Bottom samples were obtained at sta- 

 tions 1-15, 17, 18, 22-28, 30, 31, 46, 47, 

 and 60 with an Ekman dredge modified by 

 adding bars of metal to increase its weight 

 and stability (fig. 2). Descriptions of 



the bottom at these locations are listed 

 under the respective station headings. 



Current Measurements 



Currents were measured at the surface 

 by drift stick observed from the anchored 

 vessel and at 5 meters and the bottom by 

 Ekman or Gurley-Price current meter at most 

 of the stations from 1 to 33. In addition, 

 weather permitting, measurements were made 

 at approximately 2-hour intervals for par- 

 tial or complete tidal cycles at stations 

 11, 29, 30, and 31. Only drift stick obser- 

 vations were made from stations 37 to 66. 



Field logs indicated the direction of 

 the current at 5 meters, but these are 

 questionable becaiuse of the magnetic influ- 

 ence of the ship's hull. Compass deviations 

 up to 80° were reported when the Ekman meter 

 was held above the water, parallel to the 

 vessel. Conversion from magnetic to true 

 direction was made by applying 19° £. varia- 

 tion. 



Some data from the Gurley-Price meter 

 which were recorded as revolutions per 

 minute were converted from a graph of RPM 

 vs velocity constructed from complete exper- 

 imental data. 



NOTES ON TABULATED DATA 

 Hydrographic Casts 



Station description 



Position determined by 



(1) Dead reckoning 



(2) Bearings 



(3) Sights within 4 hours 



Messenger time and date, OCT 



Weather condition 



b blue sky, cloudless 



c cloudy 



d drizzle 



f fog 



m mist 



o overcast 



p passing showers of rain 



r rain 



V vairiable 



z hazy 



Barometer, in inches 



Figure 2. — Sketch of a modified Ekman dredge. 



